811642 has 32 divisors (see below), whose sum is σ = 1451520. Its totient is φ = 336960.

The previous prime is 811637. The next prime is 811649. The reversal of 811642 is 246118.

811642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (811649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15288 + ... + 15340.

It is an arithmetic number, because the mean of its divisors is an integer number (45360).

2⁸¹¹⁶⁴² is an apocalyptic number.

811642 is a deficient number, since it is larger than the sum of its proper divisors (639878).

811642 is a wasteful number, since it uses less digits than its factorization.

811642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118.

The product of its digits is 384, while the sum is 22.

The square root of 811642 is about 900.9117603850. The cubic root of 811642 is about 93.2799212536.

The spelling of 811642 in words is "eight hundred eleven thousand, six hundred forty-two".